CVE-2026-33378
published 2026-05-13CVE-2026-33378: Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the…
PriorityP336medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.33%
24.4th percentile
Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
Affected
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| grafana | grafana | — | — |
| grafana | grafana | — | — |
| grafana | grafana | — | — |
| grafana | grafana | — | — |
| grafana | grafana | — | — |
| grafana | grafana | — | — |
| grafana | grafana | >= 12.0.0 < 12.2.8 | 12.2.8 |
| grafana | grafana | >= 12.3.0 < 12.3.6 | 12.3.6 |
| grafana | grafana | >= 12.4.0 < 12.4.3 | 12.4.3 |
| grafana | grafana | >= 8.0.0 < 11.6.14 | 11.6.14 |
| grafana | grafana_oss | >= 11.6.14 < 11.6.14+security-04 | 11.6.14+security-04 |
| grafana | grafana_oss | 12.0.0 – 12.2.8 | — |
| grafana | grafana_oss | >= 12.2.8 < 12.2.8+security-04 | 12.2.8+security-04 |
| grafana | grafana_oss | 12.3.0 – 12.3.6 | — |
| grafana | grafana_oss | >= 12.3.6 < 12.3.6+security-04 | 12.3.6+security-04 |
| grafana | grafana_oss | 12.4.0 – 12.4.3 | — |
| grafana | grafana_oss | >= 12.4.3 < 12.4.3+security-02 | 12.4.3+security-02 |
| grafana | grafana_oss | 13.0.0 – 13.0.1 | — |
| grafana | grafana_oss | >= 13.0.1 < 13.0.1+security-01 | 13.0.1+security-01 |
| grafana | grafana_oss | 8.0.0 – 11.6.14 | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
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VulDB
Grafana OSS up to 13.0.1+security-00 __timeGroup denial of service (WID-SEC-2026-1546)
vuldb·2026-05-16·CVSS 6.5
CVE-2026-33378 [MEDIUM] Grafana OSS up to 13.0.1+security-00 __timeGroup denial of service (WID-SEC-2026-1546)
A vulnerability described as problematic has been identified in Grafana OSS. This vulnerability affects the function __timeGroup. Executing a manipulation can lead to denial of service.
This vulnerability appears as CVE-2026-33378. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-rr8q-qwrv-9pf6: Using the $__timeGroup macro, one can achieve an OOM by overloading the server
ghsa_unreviewed·2026-05-13
CVE-2026-33378 [MEDIUM] CWE-400 GHSA-rr8q-qwrv-9pf6: Using the $__timeGroup macro, one can achieve an OOM by overloading the server
Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
Red Hat
grafana: Grafana: Denial of Service due to Out of Memory via $__timeGroup macro
vendor_redhat·2026-05-13·CVSS 6.5
CVE-2026-33378 [MEDIUM] CWE-770 grafana: Grafana: Denial of Service due to Out of Memory via $__timeGroup macro
grafana: Grafana: Denial of Service due to Out of Memory via $__timeGroup macro
Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
A flaw was found in Grafana. A remote attacker with authenticated access to a SQL datasource can exploit a vulnerability in the `$__timeGroup` macro. By sending specially crafted queries, an attacker can cause an Out of Memory (OOM) error, leading to the Grafana server crashing and resulting in a Denial of Service (DoS). This can disrupt the availability of the Grafana instance.
Package: grafana12.4 (Red Hat Hardened Images) - Affected
Package: grafana
No detection rules found.
No public exploits indexed.
2026-05-13
Published